DEFINITION OF ERA

An interval of geologic time that is the next longest after

an eon, and the corresponding erathem of rocks deposited

during this time interval. For instance the Phanerozoic Eon is

divided in the Paleozoic, Mesozoic, and Cenozoic Eras. Some

divisions of Precambrian time place the Archean and Proterozoic

as eras in the Precambrian Eon, preceded by the Hadean

Eon, whereas others divide the Proterozoic Eon into the Paleoproterozoic,

Mesoproterozoic, and Neoproterozoic Eras, and

the Archean Eon into the Early, Middle and Late Eras.

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